 /*******************************************************************************
  * Copyright (c) 2003, 2004 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Common Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/cpl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.core.runtime.adaptor;

 import java.util.Dictionary ;
 import java.util.Enumeration ;
 import org.eclipse.osgi.framework.adaptor.FrameworkAdaptor;
 import org.eclipse.osgi.framework.log.FrameworkLogEntry;
 import org.eclipse.osgi.service.resolver.Version;
 import org.osgi.framework.BundleException;
 import org.osgi.framework.Constants;

 /**
  * Internal class.
  */
 public class CachedManifest extends Dictionary {

     Dictionary manifest = null;
     EclipseBundleData bundledata;

     public CachedManifest(EclipseBundleData bundledata) {
         this.bundledata = bundledata;
     }

     private Dictionary getManifest() {
         if (manifest == null)
             try {
                 manifest = bundledata.loadManifest();
             } catch (BundleException e) {
                 final String message = EclipseAdaptorMsg.formatter.getString("ECLIPSE_CACHEDMANIFEST_UNEXPECTED_EXCEPTION", bundledata.getLocation()); //$NON-NLS-1$
 FrameworkLogEntry entry = new FrameworkLogEntry(FrameworkAdaptor.FRAMEWORK_SYMBOLICNAME, message, 0, e, null);
                 EclipseAdaptor.getDefault().getFrameworkLog().log(entry);
                 return null;
             }
         return manifest;
     }

     public int size() {
         //TODO: getManifest may return null
 return getManifest().size();
     }

     public boolean isEmpty() {
         return size() == 0;
     }

     public Enumeration elements() {
         //TODO: getManifest may return null
 return getManifest().elements();
     }

     public Enumeration keys() {
         //TODO: getManifest may return null
 return getManifest().keys();
     }

     public Object get(Object key) {
         String keyString = (String ) key;
         if (Constants.BUNDLE_VERSION.equalsIgnoreCase(keyString)) {
             Version result = bundledata.getVersion();
             return result == null ? null : result.toString();
         }
         if (EclipseAdaptor.PLUGIN_CLASS.equalsIgnoreCase(keyString))
             return bundledata.getPluginClass();
         if (Constants.BUNDLE_SYMBOLICNAME.equalsIgnoreCase(keyString))
             return bundledata.getSymbolicName();
         Dictionary result = getManifest();
         return result == null ? null : result.get(key);
     }

     public Object remove(Object key) {
         //TODO: getManifest may return null
 return getManifest().remove(key);
     }

     public Object put(Object key, Object value) {
         //TODO: getManifest may return null
 return getManifest().put(key, value);
     }

 }
